JPH0755299Y2 - Engine supercharger cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a supercharger cooling device for an engine having a water-cooled exhaust turbocharger.

(Prior Art) Conventionally, there is widely known an exhaust turbocharger, in which intake air is pressurized by the turbocharger and supplied to a cylinder of an engine body to supercharge the engine (for example, (See JP-A-61-182421). When a water-cooled exhaust turbocharger is adopted, the cooling water discharged from the water pump is guided to the cooling section of the supercharger through the cooling water passage, and the cooling section is cooled by heat exchange with this cooling water. Is done.

(Problems to be solved by the invention) By the way, in an engine equipped with a water-cooled exhaust turbocharger as described above, when the engine is stopped, the water pump is stopped. Are accumulated, the accumulated cooling water is evaporated by the residual heat of the supercharger, and due to the head difference, the steam flows backward in the cooling water in the cooling water passage toward the water pump and produces a sound. When the engine makes a sound even though the engine is stopped in this way,
Anxiety is given to the user, and the commercial value is impaired.

The present invention was made by paying attention to such points,
The purpose thereof is to prevent the emission of the backflow sound generated when the engine is stopped as described above with a simple configuration.

(Means for Solving the Problem) In order to achieve the above object, in the present invention, the radiation of the backflow sound emitted from the cooling water passage is blocked by the intake passage structure.

Specifically, the means for solving the problems of the present invention include a water pump for pressurizing cooling water, a water-cooled exhaust turbocharger whose cooling unit is provided below the water pump, and a discharge of the water pump. A cooling water passage that connects the outlet and the cooling portion of the supercharger, and an intake passage structure that is provided in the engine body and constitutes an intake passage that introduces intake air into the engine body are provided. Further, the cooling water passage is arranged between the engine body and the intake passage structure.

(Operation) With the above configuration, in the present invention, the cooling water discharged from the discharge port of the water pump is introduced into the cooling unit of the supercharger through the cooling water passage, and heat exchange with the cooling water causes the cooling unit to cool. Is cooled.

Then, when the engine is stopped, the steam generated in the cooling portion of the supercharger flows backward in the cooling water in the cooling water passage toward the water pump due to the head difference, and sounds. But,
Since the cooling water passage is arranged between the engine body and the intake passage structure, the emission of the backflow sound is blocked by the intake passage structure and cannot be heard by the user.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

The drawing shows a turbocharger cooling device according to an embodiment of the present invention.
1 shows a rotor type sequential turbo rotary piston engine. In these figures, reference numeral 1 denotes a housing as an engine main body, and inside the housing, first, second and third casings are formed in order from the front. Polygonal rotors are arranged inside the three casings, and three working chambers are formed by the rotors inside the casings. On the right side wall of each of the first, second and third housings, a primary side intake port, a secondary side intake port and an exhaust port are provided (not shown). Therefore, as the rotor makes a planetary rotational movement, the working chamber draws in fresh air from the intake port, performs compression, explosion, expansion, and exhaust strokes, and then exhausts exhaust gas from the exhaust port.

An intake passage structure 2 forming an intake passage for introducing intake air into the housing 1 is provided on the upper portion of the housing 1. The intake passage structure 2 has a box-shaped surge tank portion 2a extending in the front-rear direction of the engine (left-right direction in FIG. 1) and having a surge tank formed therein, and one end of which is located on the right side wall of the surge tank portion 2a. It is composed of six independent intake passage portions 2b, 2c, both of the primary side and the secondary side, which are connected to each other and extend toward the right side of the engine so that the other end thereof forms a convex arc upward. These six independent intake passage portions are alternately arranged in the front-rear direction on the primary side and the secondary side. The primary-side independent intake passage portion 2b is connected to the primary-side intake port, and the secondary-side independent intake passage portion 2c is connected to the secondary-side intake port.

A throttle body 3 is attached to the surge tank portion 2a of the intake passage structure 2, and an intake housing 4 is attached to the throttle body 2. The intake housing 4 is connected to the outlet of an intercooler (not shown).

On the right side of the housing 1, a primary side exhaust turbocharger 10 and a secondary side exhaust turbocharger 20 are provided.
And are arranged at the front and rear. That is, from the front, the blower 12 on the primary side, the turbine 11 on the primary side, the turbine 21 on the secondary side, and the blower 22 on the secondary side are arranged in this order. Turbine 11 of each exhaust turbocharger 10, 20
Between the 21 and the blowers 12 and 22, there are provided connecting portions 13 and 23 for supporting the rotating shaft and connecting the turbine and the blower, and the rotating shafts are lubricated inside the connecting portions 13 and 23. And a water-cooling type cooling unit is provided so as to surround the lubricating unit, and the circumference of the rotating shaft is cooled by this cooling unit.

Further, the exhaust manifold 5 is provided in the three intake ports.
Are connected to the exhaust gas inlets of the primary side turbine 11 and the secondary side turbine 21, respectively. And the two turbines 11,21
A collective exhaust pipe 35 is connected to the exhaust outlet of the.

A primary side suction pipe 31 is connected to the intake side inlet of the primary side blower 12, and a secondary side suction pipe 32 is connected to the intake side inlet of the secondary side blower 22. The two suction pipes 31 and 32 are connected to an air cleaner (not shown). In addition, the primary blower 12
The discharge pipe 33a on the primary side is connected to the intake / exhaust port, and the discharge pipe 33b on the secondary side is connected to the intake / discharge port of the secondary blower 22. These two discharge pipes 33
The a and 33b are assembled into one discharge pipe 33. The discharge pipe 33 is connected to the inlet of the intercooler. Therefore, the fresh air taken in from the air cleaner is introduced into the blowers 12 and 22 from the suction pipes 31 and 32, pressurized by the blowers 12 and 22 driven by the exhaust energy collected by the turbines 11 and 21, and then discharged from the discharge pipes. It is guided to the intercooler from 33, cooled by the intercooler, further introduced from the intake housing 4 to the surge tank portion 2a of the intake passage structure 2, and introduced into the working chamber from the independent intake passage portions 2b and 2c. Since the present embodiment employs the sequential turbo type turbo system, in the low intake air region of the engine, the operation of the secondary turbocharger 20 is stopped and only the primary turbocharger 10 is operated, while the high intake air In the region, both the primary turbocharger 10 and the secondary turbocharger 20 are operated.

Further, a water pump 41 for pressurizing the cooling water is provided at the front part of the housing 1 and is driven by the engine output shaft. A suction pipe 42 is attached to the lower part of the housing of the water pump 41, and a discharge pipe 43 is attached to the upper part of the housing. This suction pipe
42 is connected to a radiator (not shown). Also,
The discharge pipe 43 is connected to each cooling unit of the engine. The cooling water discharge pipe 43 of the water pump 41 is located above the cooling section of the exhaust turbocharger 10, 20.

The discharge pipe 43 of the water pump 41 and the cooling unit of each exhaust turbocharger 10, 20 are connected by a cooling water supply pipe 45 as a cooling water passage. Further, the respective cooling units and the suction pipe 42 of the water pump 41 are connected by a cooling water return pipe 46 as a cooling water passage. That is, the cooling water discharged from the discharge pipe 43 of the water pump 41 is supplied to the cooling portion of each exhaust turbocharger 10, 20 via the cooling water supply pipe 45, and the supercharger by heat exchange in the cooling portion. Each part is cooled, and a suction pipe 42 of the water pump 41 is further connected through a cooling water return pipe 46.
To return to. The cooling water supply pipe 45 and the cooling water return pipe 46 are both steel pipes.

The cooling water supply pipe 45 extends rearward from the discharge pipe 43 of the water pump 41 and extends in the engine output axis direction between the housing 1 and the intake passage structure 2. Then, it is reversed at the rear part of the housing and extends forward on the right side of the housing 1 to reach between the housing 1 and the secondary turbocharger 20, where it is branched into two and then each exhaust turbocharger.
They are connected to the housing-side parts of the cooling units 10 and 20, respectively. In addition, the cooling water return pipe 46 is used for each exhaust turbocharger.
From the opposite housing side of the cooling part of 10, 20, facing forward,
It is connected to the suction pipe 42 of the water pump 41.

Incidentally, 48 is a lubricating oil supply pipe connected to the lubrication portion of each exhaust turbocharger 10, 20, and 49 is a lubricating oil return pipe connected to this lubrication portion.

Therefore, in the above embodiment, when the engine is stopped, the water pump 41 is stopped, so that the supercharger 10, 20
Cooling water stays in the cooling part of the supercharger 1
The residual heat of 0, 20 evaporates, and the vapor backflows in the cooling water of the cooling water supply pipe 45 toward the water pump 41 due to the head difference, and produces a sound. However, since the cooling water supply pipe 45 is arranged so as to extend in the engine output shaft direction between the housing 1 and the intake passage structure 2, the radiation of the backflow sound is blocked by the intake passage structure 2 for use. I can't even hear you.

Although the rotary piston engine has been described in the above embodiment, the present invention can be applied to other types of engines, for example, reciprocating type engines.

(Effects of the Invention) As described above, according to the engine supercharger cooling device of the present invention, a water pump for pressurizing the cooling water and a water-cooling type cooling unit provided below the water pump are provided. Exhaust turbocharger, a cooling water passage connecting the discharge port of the water pump and the cooling portion of the supercharger, and an intake passage forming an intake passage provided in the engine body for introducing intake air into the engine body Since the cooling water passage is provided between the engine body and the intake passage structure, the cooling portion of the supercharger is prevented while preventing the backflow sound generated when the engine is stopped from being heard by the user. Can be cooled well.

[Brief description of drawings]

The drawings illustrate an embodiment of the present invention, FIG. 1 is a plan view, and FIG.
The figure is a right side view, and FIG. 3 is a front view. 1 ... Housing (engine body) 2 ... Intake passage structure 10 ... Primary turbo supercharger 20 ... Secondary turbo supercharger 41 ... Water pump 45 ... Cooling water supply pipe (cooling water passage)

Claims (1)

[Scope of utility model registration request] 1. A water pump for pressurizing cooling water, a water-cooled exhaust turbocharger having a cooling section provided below the water pump, a discharge port of the water pump and the supercharger. A cooling water passage that connects the cooling unit and an intake passage structure that is provided in the engine body and constitutes an intake passage that introduces intake air into the engine body are provided, and the cooling water passage is connected to the engine body and the intake passage structure. A supercharger cooling device for an engine, characterized in that it is arranged between the two.